If you want to convert Lotus Notes NSF to Zimbra-tgz, then I advise you to get SysINspire NSF to PST converter software. This tool can convert NSF file into multiple file format such as NSF to PST, EML, EMLX, Yahoo Mail, Gmail, Zimbra-tgz. Etc. it has 15+ nore file format for conversion. It can export mails with attachments such as photos, contects, calendar. Etc. it has a demo version that can allow users to convert 25 items from each folder. It has a technical support all users can get help by mail or live chat. It support all version of Windows OS, even it can support all version of  Lotus Notes. It has preview option users can preview their mails before conversion.

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